1 /*- 2 * Copyright (c) 2021 Adrian Chadd <adrian@FreeBSD.org>. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23 * SUCH DAMAGE. 24 */ 25 26 #include <sys/cdefs.h> 27 __FBSDID("$FreeBSD$"); 28 29 #include <sys/param.h> 30 #include <sys/systm.h> 31 #include <sys/bus.h> 32 #include <sys/lock.h> 33 #include <sys/mutex.h> 34 #include <sys/rman.h> 35 #include <machine/bus.h> 36 37 #include <dev/extres/clk/clk.h> 38 #include <dev/extres/clk/clk_div.h> 39 #include <dev/extres/clk/clk_fixed.h> 40 #include <dev/extres/clk/clk_mux.h> 41 42 #include "qcom_clk_fdiv.h" 43 44 #include "clkdev_if.h" 45 46 /* 47 * This is a fixed divisor node. It represents some divisor 48 * that is setup by the boot environment and we don't have 49 * any need for the driver to go and fiddle with. 50 * 51 * It likely should just live in the extres/clk code. 52 */ 53 54 struct qcom_clk_fdiv_sc { 55 struct clknode *clknode; 56 uint32_t divisor; 57 }; 58 59 static int 60 qcom_clk_fdiv_recalc(struct clknode *clk, uint64_t *freq) 61 { 62 struct qcom_clk_fdiv_sc *sc; 63 64 sc = clknode_get_softc(clk); 65 66 if (freq == NULL || *freq == 0) { 67 printf("%s: called; NULL or 0 frequency\n", __func__); 68 return (ENXIO); 69 } 70 71 *freq = *freq / sc->divisor; 72 return (0); 73 } 74 75 static int 76 qcom_clk_fdiv_init(struct clknode *clk, device_t dev) 77 { 78 /* 79 * There's only a single parent here for an fixed divisor, 80 * so just set it to 0; the caller doesn't need to supply it. 81 */ 82 clknode_init_parent_idx(clk, 0); 83 84 return(0); 85 } 86 87 static clknode_method_t qcom_clk_fdiv_methods[] = { 88 /* Device interface */ 89 CLKNODEMETHOD(clknode_init, qcom_clk_fdiv_init), 90 CLKNODEMETHOD(clknode_recalc_freq, qcom_clk_fdiv_recalc), 91 CLKNODEMETHOD_END 92 }; 93 94 DEFINE_CLASS_1(qcom_clk_fepll, qcom_clk_fdiv_class, qcom_clk_fdiv_methods, 95 sizeof(struct qcom_clk_fdiv_sc), clknode_class); 96 97 int 98 qcom_clk_fdiv_register(struct clkdom *clkdom, struct qcom_clk_fdiv_def *clkdef) 99 { 100 struct clknode *clk; 101 struct qcom_clk_fdiv_sc *sc; 102 103 clk = clknode_create(clkdom, &qcom_clk_fdiv_class, &clkdef->clkdef); 104 if (clk == NULL) 105 return (1); 106 107 sc = clknode_get_softc(clk); 108 sc->clknode = clk; 109 110 sc->divisor = clkdef->divisor; 111 112 clknode_register(clkdom, clk); 113 114 return (0); 115 } 116